What is the first law of thermodynamics?

A Entropy always increases

B Energy cannot be created or destroyed (ΔU = Q - W)

C Heat flows from cold to hot

D Absolute zero cannot be reached

✓ Correct Answer: Option B

The first law of thermodynamics is energy conservation: change in internal energy = heat added minus work done by the system.

💡 Why is B) the correct answer?

The correct answer to the question "What is the first law of thermodynamics?" is Option B: Energy cannot be created or destroyed (ΔU = Q - W).

The other options — A) Entropy always increases, C) Heat flows from cold to hot, D) Absolute zero cannot be reached — are incorrect for this Everyday Science question. As explained above: The first law of thermodynamics is energy conservation: change in internal energy = heat added minus work done by the system.

📚 About This Everyday Science Practice Question

This 2-level Everyday Science question from the Physics - Heat, Light, Sound topic is part of One Paper Preparation's free exam preparation library. Each question includes the correct answer and a detailed explanation to help you understand the underlying concept, not just memorize the answer.

How to use this page: Read the question above, consider all four options (A through D), then check the highlighted correct answer and explanation. For active timed practice, start a free Everyday Science practice test or use flashcards for spaced repetition review.

Practice Everyday Science Quizzes → Browse All Questions Study Flashcards

What is the first law of thermodynamics?

✓ Correct Answer: Option B

📚 About This Everyday Science Practice Question

Related Everyday Science Questions